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Tennis Ball Launcher
Images: 8
The idea for this came from a How-To video which can be found here: http://www.wonderhowto.com/how-to-build-compressed-air-tennis-ball-cannon-278074/ The air container has a pressure regulator, pressure gauge, and a 75PSI pressure relief valve. For firing in the classroom the pressure is adjusted to 25 to 30 PSI. The grey PVC section is rated to 370PSI. The launch tube was originally PVC but the tennis ball did not fit tightly enough. The clear acrylic tube fit inside the original PVC and holds a tennis ball nicely.

Electronics
Images: 2
DIY Banana-Terminal Lug. Tubing: Precision Metals, Chicago Stock# 129 Rd Brass Tube (260) 3/16 X 0.014 Terminal Lugs: http://www.grainger.com/Grainger/GROTE-Lug-2FFW3 A quarter inch length of tubing was cut and soldered into the terminal lug. It was lightly drilled to de-burr the inside slightly widen the hole. I'll probably drill out the terminal hole or even cut a few open to make a spade lug. All-in-all it makes for a very robust adapter for a banana cable.

DatsoGallery By Andrey Datso